Fischer-Tropsch Synthesis

Jacobs, Gary; Kropf, A. Jeremy; Sarkar, A.; Marshall, Christopher L.; Cronauer, Donald C.; Davis, Burtron H.

doi:10.1201/9781420062571.ch7

Cited by 38 publications

(54 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After activation, the XANES spectra of Co/ZrO 2 / meso H‐ZSM‐5 and CoRu/ZrO 2 / meso H‐ZSM‐5 resemble that of the Co foil. The slight difference can be due to the metal–support interactions that can induce a perturbation on the electronic structure and hence on the spectral features 22c…”

Section: Resultsmentioning

confidence: 99%

Insights into the Catalytic Performance of Mesoporous H‐ZSM‐5‐Supported Cobalt in Fischer–Tropsch Synthesis

et al. 2013

View full text Add to dashboard Cite

Mesoporous H‐ZSM‐5 (mesoH‐ZSM‐5) was used as a carrier for a series of bifunctional Co‐based catalysts for Fischer–Tropsch synthesis with ZrO2 and/or Ru added as promoters. The reducibility of the catalysts was studied in detail by using temperature‐programmed reduction and X‐ray absorption spectroscopy. A comparison of the catalytic performance of Co/mesoH‐ZSM‐5 and Co/SiO2 (a conventional catalyst), after 140 h on stream, reveals that the former is two times more active and three times more selective to the C5–C11 fraction with a large content of unsaturated hydrocarbons, which is next to α‐olefins. The acid‐catalyzed conversion of n‐hexane and 1‐hexene, as model reactions, demonstrates that the improvement in the selectivity toward gasoline range hydrocarbons is due to the acid‐catalyzed reactions of the Fischer–Tropsch α‐olefins over the acidic zeolite. The formation of methane over the zeolite‐supported Co catalysts originates from direct CO hydrogenation and hydrocarbon hydrogenolysis on coordinatively unsaturated Co sites, which are stabilized as a consequence of a strong metal–zeolite interaction. Although the addition of either ZrO2 or Ru increases the catalyst reducibility considerably, it does not affect the product selectivity significantly.

show abstract

Section: Resultsmentioning

confidence: 99%

Insights into the Catalytic Performance of Mesoporous H‐ZSM‐5‐Supported Cobalt in Fischer–Tropsch Synthesis

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Jacobs et al have studied the reduction behavior of a range of FTS catalysts using temperature programmed reduction-X-ray absorption near-edge structures spectroscopy (TPR-XANES). 26 A similar methodology has been used to study the thermal activation of silica-supported Co FTS catalysts. 27 Rochet and co-workers used synchrotron radiation to study an alumina-supported Co FTS catalyst under working conditions, finding a slight further reduction of Co during the first hours of FTS.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, in situ synchrotron radiation studies are limited because the time on stream that can be practically followed during a few days of synchrotron beam time is too short to investigate the long-term deactivation of catalytic solids. [22][23][24][25][26][27][28][29] Here we present a unique combination of three microspectroscopy methods bridging four orders of magnitude in length scalesi.e., spanning the 50 μm-0.5 nm range, for studying the physicochemical processes taking place within a single catalyst particle. This multi-length scale chemical imaging approach, in principle applicable to a wide variety of catalyst systems, has been used to investigate the deactivation of an industrially relevant Co/TiO 2 FTS catalyst.…”

Section: Introductionmentioning

confidence: 99%

Active phase distribution changes within a catalyst particle during Fischer–Tropsch synthesis as revealed by multi-scale microscopy

Cats

Andrews

Stéphan

et al. 2016

Catal. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…A loading of 0.5% Pt is typical of 25% Co/Al 2 O 3 research catalysts for facilitating the reduction of cobalt oxides that strongly interact with the support. 24,27 EXAFS experiments have revealed that Pt is in contact with Co at the atomic level, with no Pt-Pt coordination observed; 28 moreover, comparing selectivity at constant conversion, Pt did not signicantly alter the selectivity of FTS compared to an un-promoted catalyst. 29 That is, the role of Pt is primarily to increase the extent of cobalt reduction to, in turn, increase the surface Co metal active site density.…”

Section: Resultsmentioning

confidence: 98%